EXPERIMENTAL INVESTIGATION ON THE CHARACTERISTICS OF SYNTHETIC JET WITH DIFFERENT ORIFICE ASPECT RATIO, THICKNESS AND FREQUENCY
Experimental investigation on the unsteady flow near the orifice of synthetic jet actuator using PIV technology, and with the phase-locked sample technique 72 instantaneous images and quantitative measurements results during one actuating cycle for three different frequency 10Hz,20Hz and 30Hz are presented, and ensemble-averaging of 350 images pairs as well.The PIV measurement results reveal the properties and structures of the unsteady flow field. Detailed study shows that in the current experiment, with fixed orifice scale and increasing frequency, the corresponding streamwise velocity increases. While with constant driving frequency and increasing aspect ratio, the maximum streamwise centerline velocity decreases while the stroke length L0 decreases, which is due to rise of the wetted perimeter respectively, thus friction near the orifice increases. Also with increasing thickness of the orifice plate d, the friction in the orifice channel increases,consequently the strokes length L0 decreases. In order to convert to more stable axis-symmetric structure, the rectangular synthetic jet begins to rearrange itself. Hence the vortex pair rapidly breaks up and existing time for coherence becomes shorter.
Li Nian Zhang Kun-yuan Sha Jiang Li Fu
Coll.of Energy and Power, Nanjing University of Aeronautics and Astronautics, Nanjing 210016,China
国际会议
昆明
英文
541-548
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）